One Motorist has 11 NIPS(Apparently).This has to be wrong.Previous Scene of Accident !!

Mustbeananswer??

The 50 sign is not part of the defence.....it is of no importance...except to the person who placed it there.WOULDNT IT BE FUNNY...if someone thought thery could lean over the barrier and put a rusty old 50 sign up to get off a speeding charge ??  

Goudy

This will give you an idea on the distance between the rogue 50, the next 40 sign and the NSL sign after the restriction.

I believe this was the rogue 50 sign
Petition · Reconsider the notice of prosecutions for the a20 Sidcup bypass which were unfair · Change.org
Notice the creamy oblong with the bright lights above in it the distance, although blurred this is where the next 40 sign is. 
You can see something round in the image to the right of the cream oblong things.

As you can see the 50 is just before the slip road for the services/McDonalds.

This is the next 40 sign eastwards after the rogue 50 sign.
Met Police investigating incorrect 50mph sign on A20 Sidcup Road near Swanley Interchange (kentonline.co.uk)

As you can see, it's actually right outside McDonalds.

If you look back as the first link picture, the creamy oblong in the distance with the bright lights above it is the menu sign that is next to the pole with the 40 sign in the picture in the second link.

Just after this 40 sign, you can see the white and black NSL sign on the Kent border.
Just to the right of the motorcyclist's head.

The "50 zone" was that short.

Mustbeananswer??

Goudy said:

This will give you an idea on the distance between the rogue 50, the next 40 sign and the NSL sign after the restriction.

I believe this was the rogue 50 sign
Petition · Reconsider the notice of prosecutions for the a20 Sidcup bypass which were unfair · Change.org
Notice the creamy oblong with the bright lights above in it the distance, although blurred this is where the next 40 sign is. 
You can see something round in the image to the right of the cream oblong things.

As you can see the 50 is just before the slip road for the services/McDonalds.

This is the next 40 sign eastwards after the rogue 50 sign.
Met Police investigating incorrect 50mph sign on A20 Sidcup Road near Swanley Interchange (kentonline.co.uk)

As you can see, it's actually right outside McDonalds.

If you look back as the first link picture, the creamy oblong in the distance with the bright lights above it is the menu sign that is next to the pole with the 40 sign in the picture in the second link.

Just after this 40 sign, you can see the white and black NSL sign on the Kent border.
Just to the right of the motorcyclist's head.

The "50 zone" was that short.

The Group are clear that the 50 sign is not part of their disgust at the way they have been treated....The Facebook Thread that I have copied and pasted has many more issues....some good/some bad.If you have ever had a Speeding Ticket you will know that you start looking for any excuse to wriggle out of it...they are not nice,If I had 11 speeding tickets I would be slitting my throat at this stage.But Goudy ...you make some good points and your pictures illustrate it well    

TooManyPoints

I believe this was the rogue 50 sign

No it is not. 

That is one of the images I mentioned in my earlier post. The problem is, the exit to the BP/McDonalds service area is nothing like the one shown in the photo. It shows a single short turn off from the inside lane. In reality the slip road to the turnoff begins as a third lane, some 2-300 yards before the exit, with a lengthy hatched area separating the slip road from the main carriageway. The Armco barrier is different and there is no large blue sign as shown in the photo (which unfortunately cannot be read). There may well be a 50 sign in the location depicted by the photo (if indeed it is an undoctered image), but that location is not on the stretch of road in question here. Here’s a GSV image (June 2023) of the actual turnoff: 

https://ibb.co/qdDmk5h 

I don’t use Facebook so cannot comment on the contents of the article. But I can see the opening. It says this:

“People fighting the a20 bypass fines. As you all know the cameras have got people doing over 40 when no adequate signage to be seen.” 

That is misleading. There is perfectly adequate signage, compliant with the regulations, and sufficient to denote the limit  throughout the stretch. As well as that, the Facebook image of a “50” sign is also misleading. It depicts a sign besides a stone wall, as if in a cutting or under a bridge. There is nowhere in the stretch that has such a wall or bridge. The road is mainly on a level above the surrounding land and the only bridge is a high level footbridge crossing a short grassed cutting, connecting a golf course to the back of a garden centre. There are a few locations in the area where a 50 sign is in a cutting. Very coincidentally, at the previous junction, Frognal Corner (where the limit is 50mph), the A20 passes under a roundabout forming the junction with the A222. Beneath that roundabout the road is in a cutting edged by stone walls, together with a 50 repeater sign, just as in the Facebook picture. Even more coincidentally the stains on the wall behind that sign are identical to those in the Facebook photo. Here's a comparison:

https://ibb.co/2FVW9by 

There seems to be a concerted effort to portray this as an episode of wicked injustice, with drivers being penalised when signage is either inadequate or misleading. It is nothing of the sort.

Goudy

The blue sign is a Blackwall Tunnel diversion ends sign for prohibited vehicles.
(there another in the opposite carriageway, banning said vehicles from the Blackwall)

It's just after the Cookham road bridge.
A20 - Google Maps

The cross hatchings are there, but the length the photo's were taken compress it to look shorter.
Google Maps

The photo in this link has been cropped around the edges a little but it's the same junction.
Petition · Reconsider the notice of prosecutions for the a20 Sidcup bypass which were unfair · Change.org

It's been taken here, roughly.
A20 - Google Maps

That's were the rogue 50 was.

You can compare the barrier changes from a "M" style armco to a single square bar, to  the Cookham road bridge railings.
Then if you scroll forward along the slip road, the barrier changes again to a 3 bar fence type railing as there's a drop to the left here on the side of the slip road. 

You can see the three bar fence railing in this image, A20v3 hosted at ImgBB — ImgBB (ibb.co)
and here
A20 - Google Maps

But if you scroll back you will see the barrier changes type several times within a few hundred metres.


This image is the dud image.
a20v4 hosted at ImgBB — ImgBB (ibb.co)

It is from further up the road before the restriction comes into force. Around 2 miles before McDonalds and the real rogue sign.
It is on the A20 under the Frognal Corner roundabout (turn off for Sidcup and Chislehurst)
Sidcup By-Pass Rd - Google Maps

Here
Google Maps

TooManyPoints

With your interpretation I think I can accept it is indeed the location. Thanks for the analysis. However, the foreshortening of the image is so pronounced (if indeed that's all it is) that it is virtually unrecognisable as the true location. I agree that is where the rogue sign was. I saw it a number of times though I believe it was there for no longer than four, perhaps five weeks at most - a spell either side of Christmas.

The other sign is indeed where you say - under Frognal Corner roundabout as I said in my earlier post (where the limit is genuinely 50mph). It has no place in the Facebook campaign other than to confuse the issue.

However, my overall point remains. The signage on the A20 and the "on" slip road from Crittals Corner adequately conveys this new limit and there is no reason whatsoever why anybody should be confused by it any more than they should be confused by any other properly placed speed limit sign.

daveyjp

Its a fact that as drivers we are very poor at recognising changes to speed limits on roads we are familiar with.  We get into autopilot and carry on as normal.

Local to me there have been many changes over the last few months, one I noticed last week is a 40 through a village becoming 30.  Another road is now average camera controlled 50 for the whole length, it was 70/60 6 months ago.  My council also appear to be changing static speed cameras with average cameras in many areas.

I once parked behind a speed camera van parked up in a layby on a road where the limit had reduced to 30 the week before.  The operator said it would be rich pickings for a month or so until regulars realise the 40 limit signs have gone, then it settles down.  Fastest he had had on that day was 48 and many more were just under 40.

Goudy

TooManyPoints said:

However, my overall point remains. The signage on the A20 and the "on" slip road from Crittals Corner adequately conveys this new limit and there is no reason whatsoever why anybody should be confused by it any more than they should be confused by any other properly placed speed limit sign.

I have the same point of view.

The stretch of road by McDonalds floods badly.
Water from the opposite carriageway runs diagonally across and pools slightly, this makes that side of the road creditable dangerous, particularly at night.
In moderate rain is can be a couple of inches deep, in really bad weather that quickly rises like a ford.

I too have good knowledge of this road, been using it regularly (couple of times a week) for over 30 years (and still no NIP).
On the odd occasion I've been in McDonalds, I've seen cars spinning off past the window and regularly passed mangled wrecks coming back the other way.

You can generally tell from the distance achieved by the spin/accident that speed has been THE factor in these accidents and as it's now become apparent with all these NIPs, it's not just my opinion.

From the last (normally last) camera by the Nuffield heath centre, traffic speed really rams up, like a F1 race after a safety car restart!
Years ago when Gatso's were new, there used to be a speed camera between the Frognal and Crittals junctions, but that got removed for some reason.

On the subject of speed cameras, I once left early one Sunday morning a couple of years ago and all the cameras on this stretch of the A20, from Dutch House onwards were on fire.
Someone had necklaced them (slung a car tyre over them and set them on fire).
They must have just done them as I drove along as they were only just getting going.